Q.

The resistance of  a conductor is 

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a

directly proportional to the square of the radius 

b

inversely proportional to the  square of the radius 

c

inversely proportional to the length

d

directly proportional to the  square root of the length 

answer is C.

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Detailed Solution

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Resistance R = ρlA

and Area A is proportional to r2.

Hence resistance of  a conductor is inversely proportional to the  square of the radius 

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